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Simultaneous nitrification and denitrification in a single reactor using bio-electrochemical process.

T Watanabe1, S Hashimoto, M Kuroda

  • 1Department of Civil Engineering, Gunma University, Kiryu-shi, Japan. watanabe@ce.gunma-u.ac.jp

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 4, 2002
PubMed
Summary

This study shows a bio-electrochemical process effectively removes total nitrogen (TN) by combining nitrification and denitrification in one reactor. Optimized electric current and dissolved oxygen (DO) levels enhance nutrient removal efficiency.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Bio-electrochemical Systems

Background:

  • Simultaneous nitrification and denitrification (SND) is crucial for effective wastewater treatment.
  • Conventional methods often require multiple reactors or complex operational conditions.
  • Bio-electrochemical systems offer a novel approach for integrated nutrient removal.

Purpose of the Study:

  • To investigate the feasibility of a single-reactor bio-electrochemical process for simultaneous nitrification and denitrification (SND).
  • To examine the effects of applied electric current and dissolved oxygen (DO) concentration on TN removal efficiency.

Main Methods:

  • Experimental investigation using a bio-electrochemical reactor with anodic and cathodic electrodes.
  • Fixation of nitrifying and denitrifying biofilms on respective electrodes.

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  • Systematic variation of applied electric current and DO concentration in the bulk solution.

    • Main Results:

    • Total nitrogen (TN) removal was achieved via nitrification on the anode and denitrification on the cathode.
    • Both nitrification and denitrification rates increased with applied electric current.
    • High nitrification rates were maintained at low DO by utilizing anode-generated oxygen.
    • Denitrification rates remained high at high DO due to hydrogen supply to the cathodic biofilm.
    • Optimal TN removal occurred at lower DO concentrations and higher current densities.

    Conclusions:

    • The bio-electrochemical process is a viable method for simultaneous nitrification and denitrification in a single reactor.
    • Stable aerobic and anoxic zones within the reactor facilitate efficient nutrient removal.
    • This technology presents a promising solution for advanced wastewater treatment.